/*
 * Copyright 2017 M. Eric DeFazio.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package varcode.context;

/**
 * Function that can be applied on Data residing in the 
 * context, whilst providing some input (String) data 
 * 
 * @author M. Eric DeFazio eric@varcode.io
 */
public interface VarScript
{
    /**
     * Evaluate and return the result of the input optionally using the Context
     * to resolve variables and methods/functions.
     * 
     * @param context context containing variables, methods, functions
     * @param input the "command / expression / parameters" to be evaluated
     * @return the result of the evaluation
     * @throws EvalException if the evaluation fails
     */
    public Object eval( Context context, String input )
	throws VarBindException;	            
}
